Japanese superstar Naomi Osaka was on Sunday threatened with disqualification from the French Open if she persists with her controversial media boycott, officials said.

“We have advised Naomi Osaka that should she continue to ignore her media obligations, she would be exposing herself to possible further code of conduct infringement consequences,” said a statement from the four Grand Slam tournaments after issuing the World No. 2 with a $15,000 fine.